diff --git a/DorkNet.Server.Tests/RoomSave2023Tests.cs b/DorkNet.Server.Tests/RoomSave2023Tests.cs
index 9b0391e..373f5f1 100644
--- a/DorkNet.Server.Tests/RoomSave2023Tests.cs
+++ b/DorkNet.Server.Tests/RoomSave2023Tests.cs
@@ -78,13 +78,20 @@ public sealed class RoomSave2023Tests : IClassFixture<DorkNetServerFactory>
 
         // 2023 commit-response contract (NEOPBOMGIOG): value must carry
         // BOTH a Room and a SubRoomDataSave or the client's post-parse
-        // validator NREs and the watch shows "Failed to save room".
+        // Dispose walk NREs and the watch shows "Failed to save room".
         var value = json.RootElement.GetProperty("value");
-        Assert.Equal(JsonValueKind.Object, value.GetProperty("Room").ValueKind);
+        var roomDto = value.GetProperty("Room");
+        Assert.Equal(JsonValueKind.Object, roomDto.ValueKind);
+        // Keys the FGCPNAACHIK mapper reads and its Dispose walk derefs.
+        foreach (var key in new[] { "RoomId", "DataBlob", "MaxPlayers", "ToxmodEnabled", "RankingContext", "SubRooms", "Roles", "Tags", "Stats" })
+            Assert.True(roomDto.TryGetProperty(key, out _), $"Room missing '{key}': {responseText}");
+        Assert.Equal(JsonValueKind.Object, roomDto.GetProperty("RankingContext").ValueKind);
+
         var save = value.GetProperty("SubRoomDataSave");
         Assert.Equal(blobName, save.GetProperty("DataBlob").GetString());
-        Assert.True(save.TryGetProperty("SubRoomDataSaveId", out _), responseText);
-        Assert.True(save.TryGetProperty("CreatedAt", out _), responseText);
+        // Keys the JKIFFPPAJNK save mapper reads.
+        foreach (var key in new[] { "SubRoomDataSaveId", "SubRoomId", "UnityAssetId", "DataBlobHash", "SavedByAccountId", "Description", "CreatedAt" })
+            Assert.True(save.TryGetProperty(key, out _), $"SubRoomDataSave missing '{key}': {responseText}");
 
         await using (var scope = _factory.Services.CreateAsyncScope())
         {
diff --git a/DorkNet.Server/Controllers/API/Rooms/V2/RoomsController.cs b/DorkNet.Server/Controllers/API/Rooms/V2/RoomsController.cs
index 99584c5..6be4c55 100644
--- a/DorkNet.Server/Controllers/API/Rooms/V2/RoomsController.cs
+++ b/DorkNet.Server/Controllers/API/Rooms/V2/RoomsController.cs
@@ -700,6 +700,12 @@ public class RoomsController(
             ReferencedUnityAssetIds = Array.Empty<string>(),
             DataBlob = dataBlob,
             DataBlobName = dataBlob,
+            // DataBlobHash + Description are read by the save mapper
+            // (JKIFFPPAJNK / PELEHJLMKJO) that the SaveRoom commit
+            // response deserializes; omitting them leaves nulls the
+            // response Dispose walk trips on.
+            DataBlobHash = (string?)null,
+            Description = string.Empty,
             PersistenceVersion = 41,
             OMVersion = 0,
             SavedByAccountId = room.CreatorPlayerId,
@@ -1978,6 +1984,26 @@ public class RoomsController(
             },
             PublishState = 0,
             MaxPlayerCalculationMode = room.MaxPlayerCalculationMode,
+            // 2023's room-details mapper (FGCPNAACHIK / GLEGPFFPDBE) reads
+            // these top-level keys and its Dispose walk (NEOPBOMGIOG.
+            // FKDDCNLJOLF, reached via the SaveRoom commit response)
+            // dereferences them — a missing RankingContext object or the
+            // DataBlob/MaxPlayers/ToxmodEnabled scalars leaves a null the
+            // walk NREs on ("Failed to save room" toast despite a
+            // persisted save). Emit them so the room DTO round-trips
+            // through the strict save-response path, not just the
+            // include-masked GET rooms/{id} path.
+            DataBlob = dataBlobName,
+            DataBlobHash = (string?)null,
+            MaxPlayers = sceneRows is { Count: > 0 } ? sceneRows[0].MaxPlayers : room.MaxCapacity,
+            ToxmodEnabled = false,
+            RankingContext = new
+            {
+                RoomId = room.Id,
+                Score = 0.0,
+                Rank = 0,
+                RankingType = 0,
+            },
             SubRooms = subRooms,
             Roles = wireRoles,
             LoadScreens = JsonArrayOrEmpty(room.LoadScreensJson),
diff --git a/docs/recroom-2023-room-save.md b/docs/recroom-2023-room-save.md
index 3c37549..68c6612 100644
--- a/docs/recroom-2023-room-save.md
+++ b/docs/recroom-2023-room-save.md
@@ -52,12 +52,20 @@ on 2026-07-07. Diagnosed while fixing "Failed to save room" /
    }
    ```
 
-   The client's post-parse validator NREs if `Room` or
-   `SubRoomDataSave` is missing — the save persists server-side but the
-   watch shows "Failed to save room". `SubRoomDataSave` keys per the
-   `JKIFFPPAJNK` mapper (`PELEHJLMKJO`): SubRoomDataSaveId, SubRoomId,
-   UnityAssetId, DataBlob, DataBlobHash, SavedByAccountId,
-   SavedOnPlatform, SavedOnDeviceClass, Description, CreatedAt.
+   The client parses each field then runs a **Dispose walk**
+   (`NEOPBOMGIOG.FKDDCNLJOLF`, reached from the SaveRoom commit
+   continuation) that dereferences the mapped children — a missing
+   nested object or scalar leaves a null it NREs on, and the save
+   persists server-side but the watch shows "Failed to save room". So
+   the `Room` DTO must carry every key the `FGCPNAACHIK` mapper
+   (`GLEGPFFPDBE`) reads, including the ones the include-masked
+   `GET rooms/{id}` path gets away without: **DataBlob**,
+   **DataBlobHash**, **MaxPlayers**, **ToxmodEnabled**, and a non-null
+   **RankingContext** object, plus SubRooms/Roles/Tags/Stats.
+   `SubRoomDataSave` keys per the `JKIFFPPAJNK` mapper (`PELEHJLMKJO`):
+   SubRoomDataSaveId, SubRoomId, UnityAssetId, DataBlob, **DataBlobHash**,
+   SavedByAccountId, SavedOnPlatform, SavedOnDeviceClass, **Description**,
+   CreatedAt.
 
 Server handling: `StorageController.Upload` (FileType 6 →
 `UploadGenericAsync("roommeta")`, CDN-servable) and